S
sourdough
Guest
this last week i was working on some loads for a hopefully future f-class T/R rifle. i've been toying with the idea of using an ar-15 for f-class, i have gotten several comments as to it won't be competitive and it could work i guess. so i figured oh what the heck i'll bite. well i've been trying to figure this sucker out as i'm a bolt action type of guy in the first place. but back to what happened i was shooting ladder targets at 200 yrds to try and find a suitable load. i realize that most guys say that 3 rounds is enough to figure where its hitting but i've always been a 5 round shooter so i was shooting 5 round groups. i was progressing up the scale from 25.0 grains of varget, when i got to 25.2 grains my group size shrunk dramatically from just over an inch to just under an inch. at 25.3 grains the group went into .330 at the same vertical location as the previous group. went to 25.4 grains the group was just over 3/4". i was a little surprised to say the least. well just for grins i took all 3 loads to 300 yrds. the 25.2 impacted the target 2 inches low of the sighting location, 1 1/4" group. the 25.4 was 1 1/2 inches high, 1 1/4 inch group. the 25.3 was spot on, with at bit more than a 1/2 inch. now this was without doing any site adjustments to the scope. i was originally sited in to hit 2 inches low at 200 yrds. the wind was from my 6 at about 18 miles per hour would the wind have been the culprit keeping the point of impact from being low during the yardage change. never had this happen before.
